1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if 0
33 #ifndef lint
34 static const char copyright[] =
35 "@(#) Copyright (c) 1980, 1986, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 static char sccsid[] = "@(#)reboot.c 8.1 (Berkeley) 6/5/93";
41 #endif /* not lint */
42 #endif
43 #include <sys/cdefs.h>
44 #include <sys/types.h>
45 #include <sys/boottrace.h>
46 #include <sys/reboot.h>
47 #include <sys/sysctl.h>
48 #include <sys/time.h>
49
50 #include <signal.h>
51 #include <err.h>
52 #include <errno.h>
53 #include <fcntl.h>
54 #include <pwd.h>
55 #include <syslog.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <unistd.h>
60 #include <utmpx.h>
61
62 static void usage(void) __dead2;
63 static uint64_t get_pageins(void);
64
65 static int dohalt;
66
67 int
main(int argc,char * argv[])68 main(int argc, char *argv[])
69 {
70 struct utmpx utx;
71 const struct passwd *pw;
72 int ch, howto, i, fd, lflag, nflag, qflag, sverrno, Nflag;
73 uint64_t pageins;
74 const char *user, *kernel = NULL;
75
76 if (strstr(getprogname(), "halt") != NULL) {
77 dohalt = 1;
78 howto = RB_HALT;
79 } else
80 howto = 0;
81 lflag = nflag = qflag = Nflag = 0;
82 while ((ch = getopt(argc, argv, "cdk:lNnpqr")) != -1)
83 switch(ch) {
84 case 'c':
85 howto |= RB_POWERCYCLE;
86 break;
87 case 'd':
88 howto |= RB_DUMP;
89 break;
90 case 'k':
91 kernel = optarg;
92 break;
93 case 'l':
94 lflag = 1;
95 break;
96 case 'n':
97 nflag = 1;
98 howto |= RB_NOSYNC;
99 break;
100 case 'N':
101 nflag = 1;
102 Nflag = 1;
103 break;
104 case 'p':
105 howto |= RB_POWEROFF;
106 break;
107 case 'q':
108 qflag = 1;
109 break;
110 case 'r':
111 howto |= RB_REROOT;
112 break;
113 case '?':
114 default:
115 usage();
116 }
117 argc -= optind;
118 argv += optind;
119 if (argc != 0)
120 usage();
121
122 if ((howto & (RB_DUMP | RB_HALT)) == (RB_DUMP | RB_HALT))
123 errx(1, "cannot dump (-d) when halting; must reboot instead");
124 if (Nflag && (howto & RB_NOSYNC) != 0)
125 errx(1, "-N cannot be used with -n");
126 if ((howto & RB_POWEROFF) && (howto & RB_POWERCYCLE))
127 errx(1, "-c and -p cannot be used together");
128 if ((howto & RB_REROOT) != 0 && howto != RB_REROOT)
129 errx(1, "-r cannot be used with -c, -d, -n, or -p");
130 if (geteuid()) {
131 errno = EPERM;
132 err(1, NULL);
133 }
134
135 if (qflag) {
136 reboot(howto);
137 err(1, NULL);
138 }
139
140 if (kernel != NULL) {
141 fd = open("/boot/nextboot.conf", O_WRONLY | O_CREAT | O_TRUNC,
142 0444);
143 if (fd > -1) {
144 (void)write(fd, "nextboot_enable=\"YES\"\n", 22);
145 (void)write(fd, "kernel=\"", 8L);
146 (void)write(fd, kernel, strlen(kernel));
147 (void)write(fd, "\"\n", 2);
148 close(fd);
149 }
150 }
151
152 /* Log the reboot. */
153 if (!lflag) {
154 if ((user = getlogin()) == NULL)
155 user = (pw = getpwuid(getuid())) ?
156 pw->pw_name : "???";
157 if (dohalt) {
158 openlog("halt", 0, LOG_AUTH | LOG_CONS);
159 syslog(LOG_CRIT, "halted by %s", user);
160 } else if (howto & RB_REROOT) {
161 openlog("reroot", 0, LOG_AUTH | LOG_CONS);
162 syslog(LOG_CRIT, "rerooted by %s", user);
163 } else if (howto & RB_POWEROFF) {
164 openlog("reboot", 0, LOG_AUTH | LOG_CONS);
165 syslog(LOG_CRIT, "powered off by %s", user);
166 } else if (howto & RB_POWERCYCLE) {
167 openlog("reboot", 0, LOG_AUTH | LOG_CONS);
168 syslog(LOG_CRIT, "power cycled by %s", user);
169 } else {
170 openlog("reboot", 0, LOG_AUTH | LOG_CONS);
171 syslog(LOG_CRIT, "rebooted by %s", user);
172 }
173 }
174 utx.ut_type = SHUTDOWN_TIME;
175 gettimeofday(&utx.ut_tv, NULL);
176 pututxline(&utx);
177
178 /*
179 * Do a sync early on, so disks start transfers while we're off
180 * killing processes. Don't worry about writes done before the
181 * processes die, the reboot system call syncs the disks.
182 */
183 if (!nflag)
184 sync();
185
186 /*
187 * Ignore signals that we can get as a result of killing
188 * parents, group leaders, etc.
189 */
190 (void)signal(SIGHUP, SIG_IGN);
191 (void)signal(SIGINT, SIG_IGN);
192 (void)signal(SIGQUIT, SIG_IGN);
193 (void)signal(SIGTERM, SIG_IGN);
194 (void)signal(SIGTSTP, SIG_IGN);
195
196 /*
197 * If we're running in a pipeline, we don't want to die
198 * after killing whatever we're writing to.
199 */
200 (void)signal(SIGPIPE, SIG_IGN);
201
202 /*
203 * Only init(8) can perform rerooting.
204 */
205 if (howto & RB_REROOT) {
206 if (kill(1, SIGEMT) == -1)
207 err(1, "SIGEMT init");
208
209 return (0);
210 }
211
212 /* Just stop init -- if we fail, we'll restart it. */
213 BOOTTRACE("SIGTSTP to init(8)...");
214 if (kill(1, SIGTSTP) == -1)
215 err(1, "SIGTSTP init");
216
217 /* Send a SIGTERM first, a chance to save the buffers. */
218 BOOTTRACE("SIGTERM to all other processes...");
219 if (kill(-1, SIGTERM) == -1 && errno != ESRCH)
220 err(1, "SIGTERM processes");
221
222 /*
223 * After the processes receive the signal, start the rest of the
224 * buffers on their way. Wait 5 seconds between the SIGTERM and
225 * the SIGKILL to give everybody a chance. If there is a lot of
226 * paging activity then wait longer, up to a maximum of approx
227 * 60 seconds.
228 */
229 sleep(2);
230 for (i = 0; i < 20; i++) {
231 pageins = get_pageins();
232 if (!nflag)
233 sync();
234 sleep(3);
235 if (get_pageins() == pageins)
236 break;
237 }
238
239 for (i = 1;; ++i) {
240 BOOTTRACE("SIGKILL to all other processes(%d)...", i);
241 if (kill(-1, SIGKILL) == -1) {
242 if (errno == ESRCH)
243 break;
244 goto restart;
245 }
246 if (i > 5) {
247 (void)fprintf(stderr,
248 "WARNING: some process(es) wouldn't die\n");
249 break;
250 }
251 (void)sleep(2 * i);
252 }
253
254 reboot(howto);
255 /* FALLTHROUGH */
256
257 restart:
258 BOOTTRACE("SIGHUP to init(8)...");
259 sverrno = errno;
260 errx(1, "%s%s", kill(1, SIGHUP) == -1 ? "(can't restart init): " : "",
261 strerror(sverrno));
262 /* NOTREACHED */
263 }
264
265 static void
usage(void)266 usage(void)
267 {
268
269 (void)fprintf(stderr, dohalt ?
270 "usage: halt [-clNnpq] [-k kernel]\n" :
271 "usage: reboot [-cdlNnpqr] [-k kernel]\n");
272 exit(1);
273 }
274
275 static uint64_t
get_pageins(void)276 get_pageins(void)
277 {
278 uint64_t pageins;
279 size_t len;
280
281 len = sizeof(pageins);
282 if (sysctlbyname("vm.stats.vm.v_swappgsin", &pageins, &len, NULL, 0)
283 != 0) {
284 warn("v_swappgsin");
285 return (0);
286 }
287 return (pageins);
288 }
289